OpenCart 🇺🇦

$this->language->load('checkout/checkout');

$this->data['text_address_existing'] = $this->language->get('text_address_existing');
$this->data['text_address_new'] = $this->language->get('text_address_new');
$this->data['text_select'] = $this->language->get('text_select');
$this->data['text_none'] = $this->language->get('text_none');

$this->data['entry_firstname'] = $this->language->get('entry_firstname');
$this->data['entry_lastname'] = $this->language->get('entry_lastname');
$this->data['entry_company'] = $this->language->get('entry_company');
$this->data['entry_company_id'] = $this->language->get('entry_company_id');
$this->data['entry_tax_id'] = $this->language->get('entry_tax_id');			
$this->data['entry_address_1'] = $this->language->get('entry_address_1');
$this->data['entry_address_2'] = $this->language->get('entry_address_2');
$this->data['entry_postcode'] = $this->language->get('entry_postcode');
$this->data['entry_city'] = $this->language->get('entry_city');
$this->data['entry_country'] = $this->language->get('entry_country');
$this->data['entry_zone'] = $this->language->get('entry_zone');

$this->data['button_continue'] = $this->language->get('button_continue');

if (isset($this->session->data['payment_address_id'])) {
	$this->data['address_id'] = $this->session->data['payment_address_id'];
} else {
	$this->data['address_id'] = $this->customer->getAddressId();
}

$this->data['addresses'] = array();

$this->load->model('account/address');

$this->data['addresses'] = $this->model_account_address->getAddresses();

$this->load->model('account/customer_group');

$customer_group_info = $this->model_account_customer_group->getCustomerGroup($this->customer->getCustomerGroupId());

if ($customer_group_info) {
	$this->data['company_id_display'] = $customer_group_info['company_id_display'];
} else {
	$this->data['company_id_display'] = '';
}

if ($customer_group_info) {
	$this->data['company_id_required'] = $customer_group_info['company_id_required'];
} else {
	$this->data['company_id_required'] = '';
}

if ($customer_group_info) {
	$this->data['tax_id_display'] = $customer_group_info['tax_id_display'];
} else {
	$this->data['tax_id_display'] = '';
}

if ($customer_group_info) {
	$this->data['tax_id_required'] = $customer_group_info['tax_id_required'];
} else {
	$this->data['tax_id_required'] = '';
}

if (isset($this->session->data['payment_country_id'])) {
	$this->data['country_id'] = $this->session->data['payment_country_id'];		
} else {
	$this->data['country_id'] = $this->config->get('config_country_id');
}

if (isset($this->session->data['payment_zone_id'])) {
	$this->data['zone_id'] = $this->session->data['payment_zone_id'];		
} else {
	$this->data['zone_id'] = '';
}

$this->load->model('localisation/country');

$this->data['countries'] = $this->model_localisation_country->getCountries();

if (file_exists(DIR_TEMPLATE . $this->config->get('config_template') . '/template/checkout/payment_address.tpl')) {
	$this->template = $this->config->get('config_template') . '/template/checkout/payment_address.tpl';
} else {
	$this->template = 'default/template/checkout/payment_address.tpl';
}

$this->response->setOutput($this->render());			

$this->language->load('checkout/checkout');

$json = array();

// Validate if customer is logged in.
if (!$this->customer->isLogged()) {
	$json['redirect'] = $this->url->link('checkout/checkout', '', 'SSL');
}

// Validate cart has products and has stock.
if ((!$this->cart->hasProducts() && empty($this->session->data['vouchers'])) || (!$this->cart->hasStock() && !$this->config->get('config_stock_checkout'))) {
	$json['redirect'] = $this->url->link('checkout/cart');
}	

// Validate minimum quantity requirments.			
$products = $this->cart->getProducts();

foreach ($products as $product) {
	$product_total = 0;

	foreach ($products as $product_2) {
		if ($product_2['product_id'] == $product['product_id']) {
			$product_total += $product_2['quantity'];
		}
	}		

	if ($product['minimum'] > $product_total) {
		$json['redirect'] = $this->url->link('checkout/cart');

		break;
	}				
}

if (!$json) {
	if (isset($this->request->post['payment_address']) && $this->request->post['payment_address'] == 'existing') {
		$this->load->model('account/address');

		if (empty($this->request->post['address_id'])) {
			$json['error']['warning'] = $this->language->get('error_address');
		} elseif (!in_array($this->request->post['address_id'], array_keys($this->model_account_address->getAddresses()))) {
			$json['error']['warning'] = $this->language->get('error_address');
		} else {
			// Default Payment Address
			$this->load->model('account/address');

			$address_info = $this->model_account_address->getAddress($this->request->post['address_id']);

			if ($address_info) {				
				$this->load->model('account/customer_group');

				$customer_group_info = $this->model_account_customer_group->getCustomerGroup($this->customer->getCustomerGroupId());

				// Company ID
				if ($customer_group_info['company_id_display'] && $customer_group_info['company_id_required'] && !$address_info['company_id']) {
					$json['error']['warning'] = $this->language->get('error_company_id');
				}					

				// Tax ID
				if ($customer_group_info['tax_id_display'] && $customer_group_info['tax_id_required'] && !$address_info['tax_id']) {
					$json['error']['warning'] = $this->language->get('error_tax_id');
				}						
			}					
		}

		if (!$json) {			
			$this->session->data['payment_address_id'] = $this->request->post['address_id'];

			if ($address_info) {
				$this->session->data['payment_country_id'] = $address_info['country_id'];
				$this->session->data['payment_zone_id'] = $address_info['zone_id'];
			} else {
				unset($this->session->data['payment_country_id']);	
				unset($this->session->data['payment_zone_id']);	
			}

			unset($this->session->data['payment_method']);	
			unset($this->session->data['payment_methods']);
		}
	} else {
		if ((utf8_strlen($this->request->post['firstname']) < 1) || (utf8_strlen($this->request->post['firstname']) > 32)) {
			$json['error']['firstname'] = $this->language->get('error_firstname');
		}

		if ((utf8_strlen($this->request->post['lastname']) < 1) || (utf8_strlen($this->request->post['lastname']) > 32)) {
			$json['error']['lastname'] = $this->language->get('error_lastname');
		}

		// Customer Group
		$this->load->model('account/customer_group');

		$customer_group_info = $this->model_account_customer_group->getCustomerGroup($this->customer->getCustomerGroupId());

		if ($customer_group_info) {	
			// Company ID
			if ($customer_group_info['company_id_display'] && $customer_group_info['company_id_required'] && empty($this->request->post['company_id'])) {
				$json['error']['company_id'] = $this->language->get('error_company_id');
			}

			// Tax ID
			if ($customer_group_info['tax_id_display'] && $customer_group_info['tax_id_required'] && empty($this->request->post['tax_id'])) {
				$json['error']['tax_id'] = $this->language->get('error_tax_id');
			}						
		}

		if ((utf8_strlen($this->request->post['address_1']) < 3) || (utf8_strlen($this->request->post['address_1']) > 128)) {
			$json['error']['address_1'] = $this->language->get('error_address_1');
		}

		if ((utf8_strlen($this->request->post['city']) < 2) || (utf8_strlen($this->request->post['city']) > 32)) {
			$json['error']['city'] = $this->language->get('error_city');
		}

		$this->load->model('localisation/country');

		$country_info = $this->model_localisation_country->getCountry($this->request->post['country_id']);

		if ($country_info) {
			if ($country_info['postcode_required'] && (utf8_strlen($this->request->post['postcode']) < 2) || (utf8_strlen($this->request->post['postcode']) > 10)) {
				$json['error']['postcode'] = $this->language->get('error_postcode');
			}

			// VAT Validation
			$this->load->helper('vat');

			if ($this->config->get('config_vat') && !empty($this->request->post['tax_id']) && (vat_validation($country_info['iso_code_2'], $this->request->post['tax_id']) == 'invalid')) {
				$json['error']['tax_id'] = $this->language->get('error_vat');
			}						
		}

		if ($this->request->post['country_id'] == '') {
			$json['error']['country'] = $this->language->get('error_country');
		}

		if (!isset($this->request->post['zone_id']) || $this->request->post['zone_id'] == '') {
			$json['error']['zone'] = $this->language->get('error_zone');
		}

		if (!$json) {
			// Default Payment Address
			$this->load->model('account/address');

			$this->session->data['payment_address_id'] = $this->model_account_address->addAddress($this->request->post);
			$this->session->data['payment_country_id'] = $this->request->post['country_id'];
			$this->session->data['payment_zone_id'] = $this->request->post['zone_id'];

			unset($this->session->data['payment_method']);	
			unset($this->session->data['payment_methods']);
		}		
	}		
}

$this->response->setOutput(json_encode($json));